CN110228890A - A kind of device and its working method for desulfurization wastewater concentration decrement - Google Patents
A kind of device and its working method for desulfurization wastewater concentration decrement Download PDFInfo
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- CN110228890A CN110228890A CN201910624504.3A CN201910624504A CN110228890A CN 110228890 A CN110228890 A CN 110228890A CN 201910624504 A CN201910624504 A CN 201910624504A CN 110228890 A CN110228890 A CN 110228890A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
- C02F2001/425—Treatment of water, waste water, or sewage by ion-exchange using cation exchangers
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
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Abstract
A kind of device and its working method for desulfurization wastewater concentration decrement；The present invention relates to waste water technical field of desulfurization, specifically include wastewater inlet pipe；Wastewater inlet pipe is connected to by water supply pipe with high dense settling pond, lime medicine system and sodium bicarbonate medicine system are provided on water supply pipe between wastewater inlet pipe and high dense settling pond, high dense settling pond passes through self-cleaning filter respectively and ultrafiltration apparatus is connected to filtered water reservoir, and filtered water reservoir is connected to ion exchange bed；Ion exchange bed is connect by one group of nanofiltration high-pressure pump with two-stage nanofiltration device；Two-stage nanofiltration device connects high pressure reverse osmosis unit；High pressure reverse osmosis unit connects electrodialysis plant；Electrodialysis plant connects MVR device；The present invention realizes the concentration to high-salt wastewater, really realizes waste water zero-emission.
Description
Technical field
The present invention relates to waste water technical field of desulfurization more particularly to it is a kind of for desulfurization wastewater concentration decrement device and its
Working method.
Background technique
Under wastewater zero discharge background, power plants' production link such as recirculating water blowdown water, reverse osmosis concentrated water, chemical workshop draining
Waste water is all pooled to desulfurizing tower, therefore desulfurization wastewater is the terminal waste water of power plant, and water quality is the most severe, utilizes technical treatment desulfurization
Waste water is the effective way for realizing wastewater zero discharge.
It realizes the zero-emission of waste water, on the one hand uses water saving art, water is taken in reduction；On the other hand pass through the step of water
It utilizes, realizes the recycling of water.
The desulfurization wastewater and boiler feedwater and condensate polishing treatment acid-alkali regeneration that Gypsum Wet thermal power plant generates
Waste water is salt content height, has aggressive waste water；The zero-emission of waste water need to finally be handled real by high-salinity wastewater zero-emission
It is existing.
Summary of the invention
The present invention overcomes above-mentioned the deficiencies in the prior art, provide a kind of device for desulfurization wastewater concentration decrement and
Its working method.The present invention connects ultrafiltration apparatus by water pipe by high dense settling pond；Ultrafiltration apparatus connects second level nanofiltration dress
It sets；Second level nanofiltration device connects high pressure reverse osmosis unit；High pressure reverse osmosis unit connects electrodialysis plant；Electrodialysis plant connection
MVR device is realized to the concentration of high-salt wastewater, really realizes wastewater zero discharge.
Technical solution of the present invention:
A kind of device for desulfurization wastewater concentration decrement, including wastewater inlet pipe, lime medicine system, sodium bicarbonate add
Medicine system, high dense settling pond, self-cleaning filter, ultrafiltration apparatus, filtered water reservoir, Weak-acid cation ion exchange bed, nanofiltration
High-pressure pump, second level nanofiltration device, high pressure reverse osmosis unit, electrodialysis plant, MVR crystallization apparatus；The wastewater inlet pipe passes through
Water supply pipe is connected to high dense settling pond, is set on the water supply pipe between the wastewater inlet pipe and the high dense settling pond
It is equipped with lime medicine system and sodium bicarbonate medicine system, the high dense settling pond passes through self-cleaning filter and ultrafiltration respectively
Device is connected to filtered water reservoir, and the filtered water reservoir is connected to ion exchange bed；The ion exchange bed is high by one group of nanofiltration
Press pump is connect with second level nanofiltration device；The second level nanofiltration device connects high pressure reverse osmosis unit；The high pressure reverse osmosis unit
Connect electrodialysis plant；The electrodialysis plant connects MVR device.
Further, the ion exchange bed is by being additionally provided with heater and nanofiltration security personnel between one group of nanofiltration high-pressure pump
Filter.
A kind of working method of the device for desulfurization wastewater concentration decrement, this method comprises the following steps:
Step a: wastewater hardness removing: desulfurization wastewater is filled as the waste water generated in power plant's production process by Dual alkali, ultrafiltration
It sets with Weak-acid cation exchange bed except hard；
Step b: second level nanofiltration: except the desulfurization wastewater after hard carries out a point salt to strong brine by second level nanofiltration, concentrated water is surveyed straight
Connect flue sprinkling system；
Step c: high pressure is reverse osmosis: the production water after second level nanofiltration is further concentrated with high pressure reverse osmosis unit；
Step d: electrodialysis: the concentrated water being concentrated to get carries out electrodialysis system, and concentrated water is further concentrated electrodialysis system；
Step e:MVR evaporative crystallization: the concentrated water after concentration enters MVR evaporative crystallization and obtains NaCl finished product salt and secondary useless
Water；
Step f: secondary cycle processing: secondary wastewater is again via lime medicine system, the processing of sodium bicarbonate medicine system
After flow into high dense settling pond, the waste water in the high dense settling pond by self-cleaning filter cleaning filtering after flow into ultrafiltration fill
It sets, is handled by ultrafiltration；The water that ultrafiltration apparatus processing is completed is removed via after filtered water reservoir into ion exchange bed
Hard processing, processing are completed.
Further, the Dual alkali is that alkali is added in waste water by lime medicine system, sodium bicarbonate medicine system
Property chemical agent.
The present invention has the advantages that compared with the existing technology
The present invention connects ultrafiltration apparatus by water pipe by high dense settling pond；Ultrafiltration apparatus connects second level nanofiltration device；
Second level nanofiltration device connects high pressure reverse osmosis unit；High pressure reverse osmosis unit connects electrodialysis plant；Electrodialysis plant connects MVR
Device is realized to the concentration of high-salt wastewater, really realizes wastewater zero discharge；
The present invention is according to Dual alkali+ultrafiltration+nanofiltration+high pressure counter-infiltration system concentration desulfurization wastewater characteristic.Using double alkali
Method+nanofiltration device carries out except firmly, except the waste water after hard divides salt by nanofiltration, flue sprinkling system is directly gone in concentrated water side desulfurization wastewater
System produces water and is further concentrated with high pressure is reverse osmosis, desulfurization wastewater water can be made to reduce to the 30~50% of former displacement；
The present invention is further concentrated reverse osmosis concentrated water using EDR (autofrequently changing pole electro dialysis) equipment, finally
Into evaporation crystallization equipment.ED ion membrane technology is the combination of ion film dialysis diffusion and electrochemical process, using homogeneous choosing
Permeability ionic membrane is selected, under the driving of applying direct current electric field, realizes the directional migration of ion, separative efficiency at normal temperatures and pressures
Height, cocnentration factor is high, and current efficiency is high.After the concentration of ED ionic membrane, TDS can be concentrated to reverse osmosis concentrated water by 30000mg/L
200000mg/L or more, cycles of concentration are 4 times of traditional handicraft, greatly reduce the subsequent water for dividing salt into crystallization, ton water
It handles power consumption and is less than 10kWh, considerably reduce the system energy consumption of waste water zero emission；
The present invention is after the concentration of ED ionic membrane, the sodium chloride for being divided to salt technique to produce using crystallization and two kinds of sodium sulphate knots
Heavy Metals index in brilliant salt is below the concentration limit of dangerous waste judging standard；The technique is realizing waste water zero emission
Meanwhile realizing crystal salt resource utilization, 90% or more dangerous waste disposition amount is reduced, dangerous waste cost of disposal is greatly lowered.Meanwhile
Subsequent evaporation device treatment scale can reduce 75%, can reduce by 20% or more overall investment.After disengagement area significantly reduces, it is
System can save 60% steam consumption quantity, reduce by 40% and operate above energy consumption；
Desulfurization wastewater is as the waste water generated in power plant's production process in the present invention, by Dual alkali (lime medicine system,
Sodium bicarbonate medicine system)+ultrafiltration apparatus+Weak-acid cation exchange bed is except hard；Except the desulfurization wastewater after hard passes through second level nanofiltration
A point salt is carried out to strong brine, flue sprinkling system is directly gone in concentrated water survey；Production water after second level nanofiltration further uses high pressure reverse osmosis
It is concentrated；The concentrated water being concentrated to get carries out electrodialysis system, and concentrated water is further concentrated electrodialysis system；Concentrated water after concentration
NaCl finished product salt is obtained into MVR evaporative crystallization.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention.
1- wastewater inlet pipe in figure；2- lime medicine system；3- sodium bicarbonate medicine system；4- high dense settling pond；5-
High dense settling pond；6- ultrafiltration apparatus；7- filtered water reservoir；8- Weak-acid cation exchanges bed；9- nanofiltration high-pressure pump；10- second level is received
Filter device；11- high pressure reverse osmosis unit；12- electrodialysis plant；13-MVR crystallization apparatus；14- heater；15- nanofiltration was ensured public security
Filter.
Specific embodiment
Below with reference to attached drawing, the present invention is described in detail.
As shown in connection with fig. 1, a kind of device for desulfurization wastewater concentration decrement disclosed in the present embodiment, including influent waste water
Pipe 1, lime medicine system 2, sodium bicarbonate medicine system 3, high dense settling pond 4, self-cleaning filter 5, ultrafiltration apparatus 6, mistake
Filter pool 7, Weak-acid cation exchange bed 8, nanofiltration high-pressure pump 9, second level nanofiltration device 10, high pressure reverse osmosis unit 11, electrodialysis
Device 12, MVR crystallization apparatus 13；The wastewater inlet pipe 1 is connected to by water supply pipe with high dense settling pond 4, the waste water
Lime medicine system 2 and sodium bicarbonate dosing system are provided on water supply pipe between water inlet pipe 1 and the high dense settling pond 4
System 3, the high dense settling pond 4 are connected to by self-cleaning filter 5 and ultrafiltration apparatus 6 with filtered water reservoir 7 respectively, the filtering
Pond 7 exchanges the connection of bed 8 with Weak-acid cation；What Weak-acid cation exchange bed 8 mainly removed is remaining calcium, magnesium, sodium in water
Wait cations, the hardness in less water；The Weak-acid cation exchange bed 8 is filled by one group of nanofiltration high-pressure pump 9 and second level nanofiltration
Set 10 connections；The nanofiltration membrane model NF270-400 (or equivalent) that second level nanofiltration device uses.Since the selection of nanofiltration membrane penetrates
Property, selectivity penetrates monovalent ion, and is not through divalent ion, to realize that monovalent salt and the effective of divalent salts divide in solution
From realization divides salt action；The second level nanofiltration device 10 is connect with high pressure reverse osmosis unit 11；High pressure is reverse osmosis to use DTRO
Film, the film model CSTDT-120 (or equivalent) of DTRO film；Concentration, concentrate are carried out to waste water by the way that high pressure is reverse osmosis
It is evaporated crystallization into evaporator, the strong brine into evaporator is minimized, the size of evaporator can be greatly lowered,
Cost of investment, operating cost and energy consumption can be effectively reduced；The high pressure reverse osmosis unit 11 is connect with electrodialysis plant 12；
The positive and negative electrode polarity reversal time is 3-4 times per hour in electrodialysis plant 12, destroys polarization layer, is not having initial precipitation crystal
There is further growth and just washed away by liquid stream before adhering on film surface, prevents film to internal precipitate fouling.ERR technology using
Cation ion-exchange membrane and anion-exchange membrane, membranous type number are respectively CMI-7000 and AMI-7001；The electrodialysis plant
12 connect with MVR crystallization apparatus 13；The partial size model for the substance that self-cleaning filter, ultrafiltration apparatus, nanofiltration cartridge filter remove
Enclose respectively 100 μm or more, 0.1 μm or more, 1nm or more.
Specifically, the Weak-acid cation exchange bed 8 is by being additionally provided with 14 He of heater between one group of nanofiltration high-pressure pump 9
Nanofiltration cartridge filter 15.
Embodiment two:
A kind of working method of the device for desulfurization wastewater concentration decrement, this method comprises the following steps:
Step a: wastewater hardness removing: desulfurization wastewater is filled as the waste water generated in power plant's production process by Dual alkali, ultrafiltration
Set 6 and Weak-acid cation exchange bed 8 except hard；
Step b: second level nanofiltration: except the desulfurization wastewater after hard carries out a point salt to strong brine by second level nanofiltration, concentrated water is surveyed straight
Connect flue sprinkling system；
Step c: high pressure is reverse osmosis: the production water after second level nanofiltration is further concentrated with high pressure reverse osmosis unit 11；
Step d: electrodialysis: the concentrated water being concentrated to get carries out electrodialysis system, and concentrated water is further concentrated electrodialysis system；
Step e:MVR evaporative crystallization: the concentrated water after concentration enters MVR evaporative crystallization and obtains NaCl finished product salt and secondary useless
Water；
Step f: secondary cycle processing: secondary wastewater again via lime medicine system 2, sodium bicarbonate medicine system 3 at
High dense settling pond 4 is flowed into after reason, the waste water in the high dense settling pond 4 after the cleaning filtering of self-cleaning filter 5 by flowing into
Ultrafiltration apparatus 6, by 6 hyperfiltration treatment of ultrafiltration apparatus；The water that the processing of ultrafiltration apparatus 6 is completed is handed over via after filtered water reservoir 7 into ion
It changes bed to carry out except hard processing, processing is completed.
Specifically, the Dual alkali is to add alkali in waste water by lime medicine system 2, sodium bicarbonate medicine system 3
Property chemical agent；In Dual alkali, the dosage of calcium hydroxide is about 9kg/ tons of water, and the dosage of sodium bicarbonate is about 1kg/ tons of water.
Conventional 2*330MW generator set desulfurization wastewater treatment energy consumption data comparison:
Above embodiments are exemplary description of this patent, do not limit its protection scope, those skilled in the art
Member can also be changed its part, as long as it does not exceed the essence of this patent, within the protection scope of the present patent.
Claims (4)
1. a kind of device for desulfurization wastewater concentration decrement, it is characterised in that: including wastewater inlet pipe (1), lime dosing system
It unites (2), sodium bicarbonate medicine system (3), high dense settling pond (4), self-cleaning filter (5), ultrafiltration apparatus (6), cross drainage
Pond (7), Weak-acid cation exchange bed (8), nanofiltration high-pressure pump (9), two-stage nanofiltration device (10), high pressure reverse osmosis unit (11),
Electrodialysis plant (12), MVR crystallization apparatus (13)；The wastewater inlet pipe (1) passes through water supply pipe and high dense settling pond (4)
It is connected to, is provided with lime medicine system on the water supply pipe between the wastewater inlet pipe (1) and the high dense settling pond (4)
(2) and sodium bicarbonate medicine system (3), the high dense settling pond (4) pass through self-cleaning filter (5) and ultrafiltration apparatus respectively
(6) it is connected to filtered water reservoir (7), the filtered water reservoir (7) exchanges bed (8) connection with Weak-acid cation；The Weak-acid cation
Exchange bed (8) is connect by one group of nanofiltration high-pressure pump (9) with two-stage nanofiltration device (10)；The two-stage nanofiltration device (10) and height
Press reverse osmosis unit (11) connection；The high pressure reverse osmosis unit (11) connect with electrodialysis plant (12)；The electrodialysis dress
(12) are set to connect with MVR crystallization apparatus (13).
2. a kind of device for desulfurization wastewater concentration decrement according to claim 1, which is characterized in that the weak acid sun
Ion exchange bed (8) is by being additionally provided with heater (14) and nanofiltration cartridge filter (15) between one group of nanofiltration high-pressure pump (9).
3. a kind of working method using a kind of device for desulfurization wastewater concentration decrement described in as claimed in claim 1 or 22, special
Sign is that this method comprises the following steps:
Step a: wastewater hardness removing: desulfurization wastewater passes through Dual alkali, ultrafiltration apparatus as the waste water generated in power plant's production process
(6) and Weak-acid cation exchange bed (8) is except hard；
Step b: two-stage nanofiltration: except the desulfurization wastewater after hard carries out a point salt to strong brine by two-stage nanofiltration, concentrated water survey is directly gone
Flue sprinkling system；
Step c: high pressure is reverse osmosis: the production water after two-stage nanofiltration is further concentrated with high pressure reverse osmosis unit (11)；
Step d: electrodialysis: the concentrated water being concentrated to get carries out electrodialysis system, and concentrated water is further concentrated electrodialysis system；
Step e:MVR evaporative crystallization: the concentrated water after concentration enters MVR evaporative crystallization and obtains NaCl finished product salt and secondary wastewater；
Step f: secondary cycle processing: secondary wastewater again via lime medicine system (2), sodium bicarbonate medicine system (3) at
High dense settling pond (4) are flowed into after reason, the waste water in the high dense settling pond (4) is cleaned by self-cleaning filter (5) and filtered
Ultrafiltration apparatus (6) are flowed into afterwards, by ultrafiltration apparatus (6) hyperfiltration treatment；The water that ultrafiltration apparatus (6) processing is completed is via filtered water reservoir
(7) enter ion exchange bed afterwards to carry out except hard processing, processing is completed.
4. a kind of working method of device for desulfurization wastewater concentration decrement according to claim 3, which is characterized in that
The Dual alkali is that alkali electroless agent is added in waste water by lime medicine system (2), sodium bicarbonate medicine system (3).
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